9909904 has 15 divisors (see below), whose sum is σ = 19224867. Its totient is φ = 4948656.

The previous prime is 9909901. The next prime is 9909917. The reversal of 9909904 is 4099099.

The square root of 9909904 is 3148.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9909901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12199 + ... + 12985.

Almost surely, 2^9909904 is an apocalyptic number.

9909904 is the 3148-th square number.

It is an amenable number.

9909904 is a deficient number, since it is larger than the sum of its proper divisors (9314963).

9909904 is an frugal number, since it uses more digits than its factorization.

9909904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1582 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 40.

The cubic root of 9909904 is about 214.7944962623.

Multiplying 9909904 by its product of nonzero digits (26244), we get a square (260075520576 = 509976²).

The spelling of 9909904 in words is "nine million, nine hundred nine thousand, nine hundred four".